In addition to Tierney, "Hustle" and "Mad Dog" actor Marc Warren has landed a recurring role on the Julianna Margulies-starring series. Warren will portray the manipulative ex-husband of Kalinda (played by Archie Panjabi), for whom she still harbors an irresistibe attraction.

Both Tierney and Warren will make their debuts on the season premiere in September.

Tierney, who was forced to drop out of NBC's "Parenthood" in order to seek treatment for breast cancer, had a recurring role in the FX drama "Rescue Me" from 2009 to 2011 and also guested on an episode of "The Office" last year.